SOLUTION: I am asking for help,please. simplify: (5x^-7x+2)-(8-4x) the 5x^ means 5x square solve: 12/x+4 = 2+ x/x+4 the / represents the fraction line

Algebra ->  Expressions-with-variables -> SOLUTION: I am asking for help,please. simplify: (5x^-7x+2)-(8-4x) the 5x^ means 5x square solve: 12/x+4 = 2+ x/x+4 the / represents the fraction line       Log On


   

Question 153340: I am asking for help,please.
simplify: (5x^-7x+2)-(8-4x)
the 5x^ means 5x square

solve: 12/x+4 = 2+ x/x+4
the / represents the fraction line
Found 2 solutions by stanbon, mangopeeler07:
Answer by stanbon(75887) About Me  (Show Source):
You can put this solution on YOUR website!
simplify: (5x^2-7x+2)-(8-4x)
= 5x^2 - 7x + 2 - 8 + 4x
= 5x^2 - 3x - 6
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solve: 12/x+4 = 2+ x/x+4
12/(x+4) = x/(x+4)
Since the denominators are the same, the numerators are equal.
x = 12
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Cheers,
Stan H.

Answer by mangopeeler07(462) About Me  (Show Source):
You can put this solution on YOUR website!
1. (5x^2-7x+2)-(8-4x)

Distribute the -:
5x^2-7x+2-8+4x

Combine like terms
5x^2-3x-6
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2. If 12/x+4 = (2+ x)/x+4:

Cancel the denominators
12=2+x

Subtract 2 from both sides
10=x
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If 12/x+4=2/1 + x/x+4:

Subtract x/x+4 from both sides
12-x/x+4=2/1

Cross multiply
12-x=2(x+4)

Distribute
12-x=2x+8

Add x to both sides
12=3x+8

Subtract 8 from both sides
4=3x

Divide both sides by 3
4/3=x
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